Amana AMH8 Operations Instructions download pdf (Page 52)

SERVICING

Amana

Electronic Air Cleaner

Ca ution

High V oltage

To avoi d per sonal in ju ry, wai t 15

secon ds aft e r de -ene rgizi ng u nit

before touching unit interior.

CUTAWAY OF DUCTWORK

TO EXPOSE COIL

SUPPLY

AIR

INCLINED

MANOMETER

RETURN

AIR

Checking Static Pressure

(80% Furnace Shown, 90% Similar)

S-201 CHECKING TEMPERATURE RISE

The more air (CFM) being delivered through a given fur-

nace, the less the rise will be; so the less air (CFM) being

delivered, the greater the rise. The temperature rise should

be adjusted in accordance to a given furnace specifica-

tions and its external static pressure. An incorrect tem-

perature rise may result in condensing in or overheating

of the heat exchanger. An airflow and temperature rise

table is provided in the blower performance specification

section. Determine and adjust temperature rise as follows:

1. Operate furnace with burners firing for approximately

ten minutes. Check BTU input to furnace - do not ex-

ceed input rating stamped on rating plate. Ensure all

registers are open and all duct dampers are in their

final (fully or partially open) position.

2. Place thermometers in the return and supply ducts as

close to the furnace as possible. Thermometers must

not be influenced by radiant heat by being able to “see”

the heat exchanger.

SUPPLY

AIR

RETURN

AIR

Checking Temperature Rise

3. Subtract the return air temperature from the supply air

temperature to determine the air temperature rise. Al-

low adequate time for thermometer readings to stabi-

lize.

4. Adjust temperature rise by adjusting the circulator

blower speed. Increase blower speed to reduce tem-

perature rise. Decrease blower speed to increase tem-

perature rise. Refer to Circulator Blower Speed sec-

tion in the Product Design section of this manual for

speed changing details. Temperature rise is related to

the BTUH output of the furnace and the amount of air

(CFM) circulated over the heat exchanger. Measure

motor current draw to determine that the motor is not

overloaded during adjustments.

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Amana AMH8 Operations Instructions Page 52

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